an object is projected directly upward from the ground. after t seconds it's distance in feet above the ground is s=144t-16t^2. how long does it take for the object to reach its maximum height? what is the maximum height the object reaches? when does it hit the ground?

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years